The justify; TEXT-INDENT: 14.2pt; MARGIN: 0cm 7.05pt 0pt 1cm; unicode-bidi: embed; DIRECTION: ltr; mso-pagination: widow-orphan" Vehicle weight and other required parameters are calculated first. Then in order to complete the conceptual platform, power transmission system analysis and design is performed through which the proper ICE is selected. After modeling and dynamic analysis, suitable gear ratios for the transmission according to automotive performance characteristics such as slope climbing, acceleration, maximum speed, low fuel consumption and emissions is designed. Furthermore, the above procedure is used for designing an electric power train for this platform. Finally, the effects of electrical components loads on the vehicle performance in both models are discussed. Ways to achieve a common platform for both drive trains is described. CATIA and ADVISOR soft wares are used for CAD and design of the propulsion system respectively. In the domestic car market, none of the three national brands own a native domestic products. In addition, technical know that is achieved in this study would be valuable for designing justify; TEXT-INDENT: 0cm; MARGIN: 0cm 7.05pt 10pt 1cm; unicode-bidi: embed; DIRECTION: ltr" Key Word ltr"